4. Microwave for 60-90 seconds. Note: cook for less time if you'd prefer more of a brownie texture, and longer if you'd like more of a cake texture.

5. Place Legendary Foods Peanut Butter Cup nut butter into a ziploc bag. Squeeze the nut butter into a corner of the bag, and cut a small hole in the corner. Slowly squeeze the nut butter out of the bag and onto the top of the mug cake. Use as much as you want ;)!